Semiconductor Nanoparticles Research Articles

Green Fabrication of Cu2O@BSA Nanoparticles, Characterization and Formation Mechanism

A green method was used to synthesize Cu2O@BSA nanoparticles (NPs). The influential factors on the morphologies of NPs were investigated. The result showed that the alkalinity of reactant solution plays an important role. Fourier transform infrared (FTIR) spectroscopy indicated that Cu2+ interacts strongly with O positioned at peptide chain and N in amide of BSA. The formation mechanism of Cu2O@BSA NPs depends on the unfolding of the peptide of BSA proceeds the electrostatic interaction between Cu2+ and BSA. The experimental results are of importance for fabrication of semiconductor NPs by using BSA or other protein as coating agents.

Molecular Bottom-Up Approaches for the Synthesis of Inorganic and Hybrid Nanostructures

Chemical routes for the synthesis of nanostructures are fundamental in nanoscience. Among the different strategies for the production of nanostructures, this article reviews the fundamentals of the bottom-up approaches, focusing on wet chemistry synthesis. It offers a general view on the synthesis of different inorganic and hybrid organic–inorganic nanostructures such as ceramics, metal, and semiconductor nanoparticles, mesoporous structures, and metal–organic frameworks. This review article is especially written for a wide audience demanding a text focused on the basic concepts and ideas of the synthesis of inorganic and hybrid nanostructures. It is styled for both early researchers who are starting to work on this topic and also non-specialist readers with a basic background on chemistry. Updated references and texts that provide a deeper discussion and describing the different synthesis strategies in detail are given, as well as a section on the current perspectives and possible future evolution.

Spontaneous chiral self-assembly of CdSe@CdS nanorods

Spontaneous chiral self-assembly of CdSe@CdS nanorods

Light-assisted fermentative hydrogen production in an intimately-coupled inorganic-bio hybrid with self-assembled nanoparticles

Photosensitizing bacterial cells with semiconductor nanoparticles is an attractive way to enhance fermentative hydrogen production metabolism via harnessing solar energy as extra driving force, but the enhancement degree is typically limited by inefficient utilization of extracellular photo-electrons. Here, an intimately-coupled inorganic-bio hybrid with enhanced hydrogen-producing activity was constructed by utilizing self-assembled selenide/ sulfide semiconductor nanoparticles (CdSexS1-x) in Escherichia coli as the light harvester. Due to circumvention of transmembrane electron transfer limitation, this hybrid exhibited 2.6-fold higher hydrogen production rate than those with extracellular nanoparticles and achieved light energy conversion efficiency as high as 27.6%. The incorporation of photocatalysis did not impair the bacterial viability, attributed to an efficient scavenging of photo-excited holes by metabolites (e.g., lactate) and minimal reactive oxygen species production. Overall, the light-assisted fermentation system developed in this study offer opportunities for sustainable production of bio-hydrogen and may be extended to bio-photocatalytic production of other valuable chemicals.

Structure, optical and photoluminescent properties of hybrid polymer nanocomposites on the base PP+CdS/ZnS

In this work, PP+CdS/ZnS transparent hybrid polymer nanocomposites were synthesized and studied. The nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive (EDS), and UV-spectroscopy analysis. It was found that the bandgap of PP+1%CdS/ZnS; PP+3%CdS/ZnS, and PP+5%CdS/ZnS; PP+10%CdS/ZnS nanocomposites is 5.2 eV, 5.1 eV, 4.6 eV, respectively. SEM analysis showed that the ZnS and CdS nanoparticles are evenly distributed in the polymer matrix. Furthermore, the average size of nanoparticles in the PP+3%CdS/ZnS, PP+5%CdS/ZnS nanocomposite is 40-54 nm, 29-56 nm, respectively. Photoluminescence properties of hybrid PP+CdS/ZnS nanocomposites were also investigated. It was established that introduction of ZnS and CdS semiconductor nanoparticles into the polypropylene matrix leads to expanding the region of the spectral sensitivity of hybrid nanocomposites. The photosensitivity of PP+CdS/ZnS nanocomposite films was also investigated.

An easy-to-work precursor and low-temperature method for synthesis of ultrafine and high purity SnS and PbS semiconductor nanoparticles

Tin (II) sulfide and lead (II) sulfide nanoparticles were successfully synthesized via a simple method using thioglycolic acid at mild condition without any need to complicated processes. The synthesized nanoparticles were characterized by different technique such as FT-IR, XRD, TEM EDAX and Uv–Vis. Image analysis confirms that SnS and PbS nanoparticles have spherical morphology and average particle size distributes in the narrow range of 2.5–10 nm. To investigate quantum confinement effect, optical band gap of the nanoparticles was measured which was higher than the bulk band gap value. This research gives a new perspective on the fabrication of novel metal sulfide nanoparticles.

Optimization and Comparison of Photovoltaic Parameters of Zinc Oxide (ZnO)/Graphene Oxide (GO) and Zinc Oxide (ZnO)/Carbon Quantum Dots (CQDs) Hybrid solar cell using Firefly Algorithm for application in Solar Trigeneration System in Commercial Buildings

Solar cells formed by the combination of organic and inorganic nanoparticle semiconductors are gaining interest in today’s era because of their major features, such as being suitable for scalable solar power conversion and being of low cost to produce desirable photovoltaic devices. This work is an attempt to develop two forms of hybrid solar cells, one by the amalgamation of zinc oxide and carbon quantum dots and second, by incorporating graphene oxide into zinc oxide. In this study, optimization, validation, and comparison of the photovoltaic parameters of the two nanostructured solar cells were attempted using the Artificial Neural Network technique. The ANN was instructed using the Firefly Algorithm. The input parameters are the spectral power density and temperature. The output parameters are the short circuit current (ISC), open-circuit voltage (VOC), fill factor of the cell (FF), and maximum voltage point prediction (VMPP). The results obtained for both the hybrid solar cells were compared and it was noted that the addition of CQDs to ZnO resulted in a considerable increase in the values of ISC, VOC and FF. The output obtained by the ANN trained model was compared with the results obtained from the experimental tests. It is observed that there is considerable agreement between the results obtained from the ANN and experimental values. The optimized values of VOC, ISC, FF, VMPP, Incident Photon to Current Efficiency (IPCE), Power Conversion Efficiency (PCE) for ZnO/GO are 0.623 V, 0.546 mA, 62%, 0.509 V, 36.95%, 9.12% respectively. Similarly values of VOC, ISC, FF, VMPP, IPCE, PCE for ZnO/CQDs are 0.636 V, 0.597 mA, 68%, 0.531 V, 40.72%, 10.35% respectively. Therefore, the precise values of all the stated parameters were obtained for both the cells after optimization and hybrid cells made of CQDs proves to be a better candidate. Also, the desirable value of the coefficient of correlation (R) is obtained, approximately close to 1, which means that the fabricated samples are efficient for useful applications. Proper execution of this algorithm on any model of the hybrid solar cell can lead to an evolution in the field of solar cells, resulting in the improvement of efficiency. These optimized cells have been utilized to propose two models of solar trigeneration system used in a commercial building North Service Centre (Olefin building) of Haldia Petrochemicals Limited, Haldia, West Bengal, India. The trigeneration systems were based on photovoltaic modules, heat pump and photovoltaic-thermal collectors. The objective is to provide enough electricity, domestic hot water, heating and cooling power to meet the typical demand of a single office building. System performance has been predicted and evaluated in the work. Considerations should be made regarding the physical constraints imposed by the environment where the installation has to be performed. The location should be carefully selected to achieve maximum efficiency.

Photoactivated Indium Phosphide Quantum Dots Treat Multidrug-Resistant Bacterial Abscesses In Vivo.

The increasing prevalence of drug-resistant bacterial strains is causing illness and death in an unprecedented number of people around the globe. Currently implemented small-molecule antibiotics are both increasingly less efficacious and perpetuating the evolution of resistance. Here, we propose a new treatment for drug-resistant bacterial infection in the form of indium phosphide quantum dots (InP QDs), semiconductor nanoparticles that are activated by light to produce superoxide. We show that the superoxide generated by InP QDs is able to effectively kill drug-resistant bacteria in vivo to reduce subcutaneous abscess infection in mice without being toxic to the animal. Our InP QDs are activated by near-infrared wavelengths with high transmission through skin and tissues and are composed of biocompatible materials. Body weight and organ tissue histology show that the QDs are nontoxic at a macroscale. Inflammation and oxidative stress markers in serum demonstrate that the InP QD treatment did not result in measurable effects on mouse health at concentrations that reduce drug-resistant bacterial viability in subcutaneous abscesses. The InP QD treatment decreased bacterial viability by over 3 orders of magnitude in subcutaneous abscesses formed in mice. These InP QDs thus provide a promising alternative to traditional small-molecule antibiotics, with the potential to be applied to a wide variety of infection types, including wound, respiratory, and urinary tract infections.

Structural, Optical and Magnetic Properties of Zn1−xCdxO Diluted Magnetic Semiconductors Nanoparticles

Structural, Optical and Magnetic Properties of Zn1−xCdxO Diluted Magnetic Semiconductors Nanoparticles

Electronic structure of semiconductor nanoparticles from stochastic evaluation of imaginary-time path integral

In the Kohn-Sham orbital basis imaginary-time path integral for electrons in a semiconductor nanoparticle has a mild Fermion sign problem and is amenable to evaluation by the standard stochastic methods. This is evidenced by the simulations of silicon hydrogen-passivated nanocrystals, such as $Si_{35}H_{36},~Si_{87}H_{76},~Si_{147}H_{100}$ and $Si_{293}H_{172},$ which contain $176$ to $1344$ valence electrons and range in size $1.0 - 2.4~nm$, utilizing the output of density functional theory simulations. We find that approximating Fermion action with just the leading order polarization term results in a positive-definite integrand in the functional integral, and that it is a good approximation of the full action. We compute imaginary-time electron propagators in these nanocrystals and extract the energies of low-lying electron and hole levels. Our quasiparticle gap predictions agree with the results of high-precision calculations using $G_0W_0$ technique. This formalism can be extended to calculations of more complex excited states, such as excitons and trions.

Photosensitive hybrid polymer nanocomposites on the base PVDF+CdS/ZnS for solar cells application

ABSTRACT Combined hybrid nanocomposites based on PVDF+CdS/ZnS were developed and studied. The structure of nanocomposites was characterized by XRD, SEM, EDS, UV- spectroscopic techniques. XRD analysis shows that the incorporation of CdS and ZnS semiconductor nanoparticles leads to a decrease in the fraction of the α-phase and an increase in the β-phase of the polymer. It was determined that the bandgap of the nanocomposite based on PVDF+1%CdS/ZnS, PVDF+3%CdS/ZnS, PVDF+5%CdS/ZnS and PVDF+10%CdS/ZnS is 5.3 eV, 5.0 eV, 4.3 eV and 3.1 eV, respectively. The photoluminescence properties of the polymer nanocomposites were also examined. It was established that for these nanocomposites, the introduction of the CdS/ZnS nanoparticles into the polymer matrix leads to expanding of the spectral-sensitive region of the PL spectrum of the nanocomposites. It was shown that combine hybrid nanocomposites on the base of PVDF+CdS/ZnS emit the light at the wide-wavelength-range. According to this feature, it is possible to use these nanocomposites in various fields of optoelectronics as the active elements of solar batteries, cells, displays, converters, etc. The photosensitivity of the PVDF+CdS/ZnS films was discovered. It gives the possibility to use these materials as thermoplastic photoresistors.

Revealing the Surface Structure of CdSe Nanocrystals by Dynamic Nuclear Polarization-Enhanced 77Se and 113Cd Solid-State NMR Spectroscopy.

Dynamic nuclear polarization (DNP) solid-state NMR (SSNMR) spectroscopy was used to obtain detailed surface structures of zinc blende CdSe nanocrystals (NCs) with plate or spheroidal morphologies which are capped by carboxylic acid ligands. 1D 113Cd and 77Se cross-polarization magic angle spinning (CPMAS) NMR spectra revealed distinct signals from Cd and Se atoms on the surface of the NCs, and those residing in bulk-like environments, below the surface. 113Cd cross-polarization magic-angle-turning (CP-MAT) experiments identified CdSe3O, CdSe2O2, and CdSeO3 Cd coordination environments on the surface of the NCs, where the oxygen atoms are presumably from coordinated carboxylate ligands. The sensitivity gain from DNP enabled natural isotopic abundance 2D homonuclear 113Cd-113Cd and 77Se-77Se and heteronuclear 113Cd-77Se scalar correlation solid-state NMR experiments which revealed the connectivity of the Cd and Se atoms. Importantly, 77Se{113Cd} scalar heteronuclear multiple quantum coherence (J-HMQC) experiments were used to selectively measure one-bond 77Se-113Cd scalar coupling constants (1J(77Se, 113Cd)). With knowledge of 1J(77Se, 113Cd), heteronuclear 77Se{113Cd} spin echo (J-resolved) NMR experiments were used to determine the number of Cd atoms bonded to Se atoms and vice versa. The J-resolved experiments directly confirmed that major Cd and Se surface species have CdSe2O2 and SeCd4 stoichiometries, respectively. Considering the crystal structure of zinc blende CdSe and the similarity of the solid-state NMR data for the platelets and spheroids, we conclude that the surface of the spheroidal CdSe NCs is primarily composed of {100} facets. The methods outlined here will generally be applicable to obtain detailed surface structures of various main group semiconductor nanoparticles.

Semiconducting Nanoparticles: Single Entity Electrochemistry and Photoelectrochemistry.

Semiconducting nanoparticles (SC NPs) play vital roles in several emerging technological applications including optoelectronic devices, sensors and catalysts. Recent research focusing on the single entity electrochemistry and photoelectrochemistry of SC NPs is a fascinating field which has attained an increasing interest in recent years. The nano-impact method provides a new avenue of studying electron transfer processes at single particle level and enables the discoveries of intrinsic (photo) electrochemical activities of the SC NPs. Herein, we review the recent research work on the electrochemistry and photoelectrochemistry of single SC NPs via the nano-impact technique. The redox reactions and electrocatalysis of single metal oxide semiconductor (MOS) NPs and chalcogenide quantum dots (QDs) are first discussed. The photoelectrochemistry of single SC NPs such as TiO2 and ZnO NPs is then summarized. The key findings and challenges under each topic are highlighted and our perspectives on future research directions are provided.

Roles of the Debye Length and Skin Depth in the Characterization of Space Charge Interactions in Semiconductor Nanoparticles

Non-degenerate semiconductor nanoparticles with bulk plasma frequency in the terahertz frequency range are of substantial current interest for device and sensing applications in that part of the electromagnetic spectrum. The penetration of electromagnetic field in a material containing mobile charges is governed by two length scales, namely the Debye length and the skin depth. Their relative influence on the response of a semiconductor nanoparticle to an external terahertz electric field is examined in this Letter. A transport-based formulation to describe charge-field interactions by coupling the Boltzmann equation with the field equations is employed to characterize space-charge effects. Numerical results computed with the charge transport formulation reveal that plasmonic interactions in a semiconductor nanoparticle remains a surface phenomenon up to the surface plasmon resonance frequency, beyond which it evolves into a bulk phenomenon as the inertia effect of the charge carriers subdues their response to the field, which penetrates deeper into the particle as the frequency is increased. Examination of the spectra of charge, field, and current distributions allows for the identification of the influence of particle size, Debye length and skin depth on space charge interactions in a semiconductor nanoparticle.

(Invited) Electronic and Optical Properties of Quantum-Confined Nanoparticles

We discuss the electronic and optical properties of semiconducting nanoparticles in the quantum-confinement regime and how they can be modeled accurately using first-principles calculations. We address how band-like features emerge from finite electronic states with increasing particle size and how we can control the characteristics of the electronic band structure by means of surface chemistry and alloying. In particular, we are focusing on technological important issues such as bandgap engineering of both magnitude of the bandgap as well as transition type (indirect vs. direct bandgap) and process stability of nanoparticles. We discuss this for several type of semiconducting nano particles composed of environmentally friendly materials, namely we discuss: (i) the origin of the experimentally observed change of the bandgap silicon (Si) nanoparticles upon functionalization with OH groups. We show that the decisive factor here is not as previously proposed surface-strain but charge transfer from the OH groups to the surface electronic states of the particle. (ii) How surface states control the optical properties of silicon carbide (SiC) nano particles, which can lead to in terms of quantum-confinement counter intuitive level diagrams We correlate the frontier electronic states to the measured absolute positions of the conductance band minimum and valance band maximum. (iii) Transition from indirect to direct bandgaps in ultrasmall tin (Sn) and alloyed silicon-tin (SixSn1-x) nanoparticles. Ultrasmall tin nanoparticles are found to have indeed a direct bandgap as recent measurements have proposed but its comparable small bandgap make applications difficult. We show that also for high enough Sn concentration binary silicon-ton alloyed nanoparticles can change their bandgap characteristic from indirect to direct, however the required tin concentration is larger than what one would expect from what is know for bulk silicon-tin. (iv) Lastly, we also investigate the thermal stability of silicon and tin nanoparticles which is especially important for high temperature processing necessary for in cooperating the nanoparticles into existing silicon technologies such as photovoltaic devices. We show that depending on the nanoparticles crystal structure they can remain stable up to several hundred degrees Celsius.

Metallated Ionic Liquids: Electrochemical Properties and Precursor Material for Mixed Metal Sulfides

Driven by the ongoing transition from non-renewable to renewable energy sources, organic and hybrid solar cells have been studied due to their cost-efficiency and the smaller environmental impact. The goal of the current work is the establishment of ionic liquid precursors (ILPs) for the synthesis of complex metal chalcogenides. These can then be used in different applications including the active layers of organic photovoltaic systems. The major difference to more conventional approaches is that the ILP not only acts as a metal source but also as a morphology directing template and as a stabilizer for the resulting nanoparticles.1,2 The basic idea is to use metal-containing ionic liquids, where the metal is an integral part of the IL anion as the metal source and to generate mixed metal chalcogenides directly from these single source precursors.3,4 In the current proof-of-concept study, thirteen N-butylpyridinium salts, including three monometallic compounds [C4Py]2[MCl4], nine bimetallic compounds [C4Py]2[M1-x aMx bCl4] and one trimetallic compound [C4Py]2[M1-y-z aMy bMz cCl4] (M = Co, Cu, Mn; x = 0.25, 0.50 or 0.75 and y = z = 0.33), were synthesized and their structure and thermal and electrochemical properties were analysed. All compounds are ILs with melting points between 69 and 93 °C. The possibility of the direct use of these ILs in electrochemical devices was further analysed. The electronic conductivity at room temperature is between 10-4 and 10-8 S cm-1. This correlates with the optical band-gap measurements indicating rather poor semiconductors with large band gaps. However, at elevated temperature approaching the melting points, the conductivities reach up to 1.47 ∙ 10-1 S/cm at 70 ºC. Therefore future electrochemical applications are possible, especially in a moisture-sensitive environment at room temperature. Furthermore, cyclic voltammetry shows promising electrochemical stability windows between 2.5 and 3.0 V.5 A further advantage of these ILPs is the fact that their properties, such as band gaps can directly be adjusted by proper choice of the metals in the ILs. Current research includes the expansion of possible ILPs by incorporating metals like zinc and nickel, and even lanthanides, such as samarium, terbium and europium, as well as incorporating different halides. Through a reaction of these metal-containing ILs with a sulphur source the respective metal chalcogenide (MC) nanoparticles will form.1 Current research focusses on investigating the influence of different sulfur sources. The p-type semiconductor nanoparticles will then be used as a hole transport material in the bulk heterojunction to improve the charge transport as well as providing a broad optical absorption window.1 Y. Kim, B. Heyne, A. Abouserie, C. Pries, C. Ippen, C. Günter, A. Taubert and A. Wedel, J. Chem. Phys., , DOI:10.1063/1.4991622.2 A. Abouserie, G. El-Nagar, B. Heyne, R. Sarhan, Y. Kim, C. Pries, E. Ribacki and C. Günter, Hierarchically structured Copper Sulfide Microflowers with Excellent Amperometric Hydrogen Peroxide Detection Performance, 2019.3 K. Thiel, T. Klamroth, P. Strauch and A. Taubert, Phys. Chem. Chem. Phys., 2011, 13, 13537.4 A. Abouserie, K. Zehbe, P. Metzner, A. Kelling, C. Günter, U. Schilde, P. Strauch, T. Körzdörfer and A. Taubert, Eur. J. Inorg. Chem., 2017, 5640–5649.5 C. Balischewski, K. Behrens, K. Zehbe, C. Guenter, S. Mies, E. Sperlich, A. Taubert and A. Kelling, Chem. – A Eur. J., , DOI:10.1002/chem.202003097.

Using the Electrode Potential to Orient Single Molecules in Nanoscale Electrical Junctions and Determine Charge Transport Mechanism

Charge transport through and between molecules is central to important processes in nature. Studying the conductivity of single molecules can contribute to a better understanding of charge transport, and also help to develop building blocks of molecular electronics, light harvesting devices, etc. We measure the conductivity of molecules using the Scanning Tunneling Microscope break-junction (STM-BJ) method that utilizes repeatedly formed circuits where one or a few molecules are trapped between two electrodes, at least one of which has nanoscale dimensions. The statistical analysis of thousands of measurements yields the conductance of single molecules.One particular interest is the role of the molecule-electrode contact and orientation in charge transport. In the simplest analysis this contact can present a substantial barrier to charge injection, which can have important consequences in devices such as dye sensitized semiconductor nanoparticle solar cells. Our most recent developments include controlling the orientation of the molecule in the junction using the electrode potential so that we can measure conductance along different molecular axes, accessing elements of the anisotropy of the molecular conductance tensor. Specifically, when the molecule is oriented flat, with the molecular plane parallel to the electrode surface, charge transport is measured perpendicular to the molecular plane. Furthermore, the electrode dependence of the molecular conductivity provides insight into the transport mechanism. This approach can be applied to molecules that do not have suitable molecular anchoring groups for traditional STM-BJ measurements, and allows us to determine the importance of anchoring groups in charge transport in molecular junctions.

(Invited) Photoresponsive Multiplexed Carbon Nanotube-Hybrid Nanoscale Devices

By synergistically combining the individual properties of more than one nanoscale component, research efforts on hybrid structures assembly and their features represent a key motivation for making future functional nanomaterials. In this regard, we developed different platforms based on the in-solution assembly of classes of molecular materials (organic, inorganic, and biological with promising attributes) to single-walled carbon nanotubes (SWCNTs), employed as building blocks that allow for nanoscale studies to be performed in a variety of research fields.[1-7] In this talk, we will present a one-pot assembly strategy for the construction in aqueous solution of hybrid nanostructures comprising inorganic semiconducting nanoparticles (CdS and PbS) grown on carbon nanotubes templates, and their organization in multiplexed nanoscale devices exhibiting photoinduced electrical response.[8] The electrical response observed suggests different processes within the hybrids, depending on the inorganic material employed, i.e. CdS or PbS. We investigated the behaviour of the hybrids via transient absorption spectroscopy, which further cast light on the different photoresponses of our devices.[8] The strategy we developed is of general applicability for the controlled fabrication of CNT-based multiplexed photoresponsive optoelectronic hybrid systems and devices. [1] Journal of the American Chemical Society, 2016, 138, 2905-2908[2] Angewandte Chemie International Edition, 2019, 2019, 59, 9928-9932[3] Small, 2017, 13, 1603042[4] Advanced Science, 2018, 5, 1800596[5] Chemistry of Materials, 2019, 31, 1537-1542[6] Journal of the American Chemical Society, 2017, 139, 17834-17840[7] Nano Letters, 2018, 18, 4130-4135[8] Submitted

Surface Structural Control of Oxide Semiconductor Nanoparticles for Transparent Heat-insulating Applications

Surface Structural Control of Oxide Semiconductor Nanoparticles for Transparent Heat-insulating Applications

Effects of Ni - substitution on structural, magnetic hyperthermia, photocatalytic and cytotoxicity study of MgFe2O4 nanoparticles

Over the last two decades, magnetic hyperthermia (MH) has become a significant capable additional method to well-recognized cancer treatments such as chemotherapy and radiotherapy. The Mg1−xNixFe2O4 (x = 0.1, 0.2, 0.3, 0.4 and 0.5) spinel ferrite nanoparticles (SFNPs) were successfully synthesized and assessed them as agents for MH affect. The synthesized NPs were well characterized for structure, morphology, and particle size, and weight loss using X-ray diffractometer (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectrophotometer (FT-IR), and thermogravimetric analysis (TGA). Prepared powder samples saturation mass magnetization (Ms) values were enhanced with the enhancing of the Ni2+ -concentration. The Ms values were found to be 40.72–48.18 emu g−1. The synthesized SFNPs as MH agents display well specific heat generation rate (SGHR) values 97–328 W g−1 at a constant frequency of 316 kHz, hence the present synthesized SFNPs could be useful for MH applications and can be used as a significant heating cause for thermal therapy MH treatment of cancer. The synthesized samples were exhibits good Ms, best morphology, monodispersed performance, significant Ms and best SHGR values. All these types of characteristics are vital, for their use in MH treatment of cancer application. The photocatalytic degradation efficiency (DE%) was examined by degrading methylene blue (MB) under visible light radiation in the multi-lamp photoreactor. Our results designate that, Ni2+-substituted MgFe2O4 SFNPs can be best employed for effective wastewater purification. Nearly monosized Ni2+- doped MgFe2O4 NPs exhibited better photocatalytic activity of MB under visible light radiation. These types of catalysts could be useful in wastewater treatment applications. The synthesized biocompatible magnetic semiconductor nanoparticles can be utilized as photocatalysts and could also be recycled and separated by applying an external magnetic field. The developments of monosize NPs with significant Ms are required for advanced biomedical as well as electronic applications. Cytotoxicity studies conducted in MCF-7, MDA-MB-231 breast cancer cells, and normal keratinocyte cells showed that the synthesized NPs are biocompatible but possessed a very toxic effect on MCF-7 and MDA-MB-231 cell lines may be owing to the generation of reactive oxygen species and/or ferroptosis.